Joubert was part of the ensemble cast on the CBC radio comedy series Le Festival de l'humour québécois from 1974 to 1989. On television, he was a regular on the French-language sitcoms Moi et l'autre (1966-1971), as landlord Monsieur Lavigueur, and also composed the theme song. He co-starred on another sitcom Chez Denise (1979-1982), as chef Firmin Lapaliss and then reprised it on two spin-offs.